Question: What is a good explanation of the Graph Isomorphism problem, which would be understandable - and hopefully exciting - to a person who has minimal exposition to mathematics? Note that I do ...
Motivation: I am trying to prove a certian geodesic is minimizing. The only generic tool I know for doing that is the fact the a gedoesic is minimizing as long as it stays in a normal neighbourhood of ...
We know that any compact symmetric operator on a Hilbert space, has a orthogonal base of eigenvectors. But we also know that $0$ is in the spectrum if $X$ is infinite dimensional, which makes the ...